Hi DasNasenloch,
Hopefully I can shed some light on MBs using the HS142 or Honda GXH50. Both motors are quality units, and although I use both, I think the HS is the better choice. There are several reasons I chose the HS over the Honda. The HS is already setup for MB use whereas the Honda isn't. The HS has a larger main jet in the carburetor and does rev higher. The Honda is rated with slightly more HP, but can not keep pace with the HS motor. The Honda is far more expensive, and requires several changes for MB use. I normally dislike Chinese products, however the HS motor is the exception. In the last 2.5 years EZM has sold hundreds of HS motors, and our warranty [1 year] issues have been limited to a single float and a handfull of rope starters.
I have watched Both Honda and HS motors [not from EZM] drop the rod , and after a little research the reason was easy to find. EZM ships our kits with the Q-Matic drive with a realistic drive ratio. Our sytems leave with a final drive ratio of 15.48 X 1 [can be altered to 16.43 X 1, or 14.68 X1] whereas most other companies play with numbers in the 25 X 1 arena. To understand the problem, just start your car, place it in low gear, hold the throttle wide open, then send me an email telling me how long the motor lasted.
Almost daily someone orders a Q-Matic drive, tells me they aren't interested in top speed, then asks if it will do 40 MPH or better.
When we designed the Q-Matic we understood the need to stay within state laws. In order to keep the MB "legal" we needed to keep it under 30 MPH with average rider on level ground. We had 2 choices to reach our goal, either gear it crazy so it would quickly reach 30 MPH, or gear it to simply run out of power at approx 30 MPH. Here is how it really works............. EZM Q-Matic drive with stock ratios of 15.48 X 1 = 30 MPH @ 6000 RPMs, 35 MPH @ 7000 RPMs [still below redline]. The motor redline is 7800, therefore cruising at 6000 RPMs is near the peak torque for a smoother ride. When shipped with 25 X 1 ratios [Not EZM] the motor isn't under much load, quickly reaches and exceeds the 7800 RPM redline, and produces numbers like this............10,000 RPMs @ 30 MPH, 11,400 RPMs @ 35 MPH. Can you say KABOOM!.
While it is true the Q-Matic doesn't leap from the stop sign it still has plenty of power to leave without pedal assist, and reach realistic cruising speeds without sending the motor into orbit. There is a major difference in motor vibration cruising at 30 MPH at 6000 RPM as opposed to 10.000 RPMs
Hopefully this bit of infromation will lead to the conclusion the HS & Honda motors are great, just some bad design & judgment in the drive systems offered.
BTW Honda doesn't offer ANY warranty if the GXH50 is used on a motorbike, zero, nada, none!
Have fun,